Add m2o

src/modules/settings/routes/data-model/field-detail/components/schema.vue

@@ -82,6 +82,11 @@ export default defineComponent({
 		const typesWithLabels = computed(() =>
 			types
 				.filter((type) => {
+					// Only allow primary key types in m2o fields
+					if (props.type === 'm2o') {
+						return ['integer', 'string', 'uuid'].includes(type);
+					}
+
 					// Remove alias and unknown, as those aren't real column types you can use
 					return ['alias', 'unknown'].includes(type) === false;
 				})
@@ -94,7 +99,7 @@ export default defineComponent({
 		);
 
 		const typeDisabled = computed(() => {
-			return props.type !== 'standard';
+			return ['file', 'files', 'o2m', 'm2m'].includes(props.type);
 		});
 
 		return { _field, typesWithLabels, setType, typeDisabled };

src/modules/settings/routes/data-model/field-detail/field-detail.vue

@@ -198,6 +198,25 @@ export default defineComponent({
 				);
 			}
 
+			if (props.type === 'm2o') {
+				relations.value = [
+					{
+						collection_many: props.collection,
+						field_many: '',
+						primary_many: fieldsStore.getPrimaryKeyFieldForCollection(props.collection)?.field,
+						collection_one: '',
+						primary_one: fieldsStore.getPrimaryKeyFieldForCollection('directus_files')?.field,
+					},
+				];
+
+				watch(
+					() => fieldData.field,
+					() => {
+						relations.value[0].field_many = fieldData.field;
+					}
+				);
+			}
+
 			return { fieldData, relations };
 		}